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In Reply to: RE: Is there a BD139 equivalent which has a faster slew rate? ... posted by beautox on July 07, 2014 at 15:34:05
As I think I mentioned in my original post, I wasn't sure whether the guy who told me the BD139 was 'slow' knew what he was talking about. :-))
However, unless I'm mistaken, shirley a PS, yes, might be designed to produce a constant voltage but the devices hooked to the DC rail are responding to the music signal voltage going through them and so are placing differing current demands on the (constant) DC rail? So it is by no means "steady state"? So the (transistor) regulator needs to be 'fast' to be able to keep up with these demands?
Regards,
Andy
Follow Ups:
I get your point, but slew rate is the speed that the voltage can change.
Consider an analogy (yes I know it's a minefield). A car's 'slew rate' would be it's ability to accelerate and brake (ie change speed). My point was that the vehicle in question was only required to go at a constant speed. However it may face a varying load, and will have to modulate the gas pedal to maintain a constant speed. To do this effectively, it's not a fast slew rate that's needed; rather the ability to measure and respond to changes in load.
Back to your problem - changing transistors might help your sound, but if so, it might not be that related to slew rate (alone). But also it might make the sound worse. Not every change is positive.
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